ABSTRACT

Pipeline installation into deep waters puts higher demands for the laying design. To reveal pipelay parametric effects on the pipeline dynamic behaviours, this study developed a dedicated finite element model (FEM) for deepwater S-lay system in light of OrcaFlex. This FEM sufficiently considered the clashing contacts between the pipeline and stinger rollers as well as pipe-seabed interactions. The effectiveness of the FEM was validated by contrast with the calculated values obtained from an analytical model. A group of real sea state data was collected from a pipeline installation project in the LW3-1 gas field. Extensive numerical analyses of laying pipelines for various pipelay parameters were carried out under the dynamic excitations of surface waves, ocean currents and induced vessel motions. The influences of water depth, effective tension fed from tensioners, stinger length, pipe diameter and submerged self-weight on the pipeline dynamic behaviours were systematically evaluated. A strong relevance between pipelay parameters and pipeline responses was observed, which could provide a practical reference for the deepwater installation design.

摘要

管道安装到深水中对铺设设计提出了更高的要求。为了揭示管道敷设参数对管道动态行为的影响，本研究根据OrcaFlex开发了一种专用于深水S铺筑系统的有限元模型（FEM）。该有限元法充分考虑了管线与托管辊之间的碰撞接触以及管线与海床之间的相互作用。通过与从分析模型获得的计算值进行对比，验证了有限元法的有效性。从LW3-1气田的管道安装项目中收集了一组真实的海况数据。在表面波，洋流和引起的船舶运动的动态激励下，对各种管道铺设参数的管道铺设进行了广泛的数值分析。水深的影响 系统地评估了由张紧器提供的有效张力，刺管长度，管道直径和淹没自重对管道动力学行为的影响。观察到了管道铺设参数与管道响应之间的强烈相关性，可为深水安装设计提供实际参考。